The Food, Drink, and Lodging table in the Expenses section of the rulebook lists the prices for a single night's inn stay.
These prices are normally included in the lifestyle expenses, but since I don't currently use those they can also be used separately per need.
However, the rules aren't very clear about whether the prices are per room or per person.
For example, if a group of 4 PCs rents a room at a Comfortable inn, listed at 8 sp per night, does each PC pay 8 sp? Or do they split the price, with each PC paying only 2 sp?